A method for on-line detection of glass thickness and draw length

Abstract

The application discloses a kind of glass thickness and draw amount online detection method, the conveying direction of crossbar and conveying track exists angle θ;Speed measuring wheel is pressed on glass, rotate following glass movement, according to the glass speed v1 measured by speed measuring wheel, thickness test mechanism moving speed v2, make v1 and v2 satisfy v1=v2·cosθ, the average value of each point measured by thickness test mechanism obtains glass thickness average d;When thickness test mechanism moves, initial detection glass is recorded as starting time t1, glass is not detected and is recorded as end time t2, glass effective detection time t=t2-t1;Calculate glass oblique width L, glass width is w=L*sinθ;According to different glass type, calculate the compensation coefficient x of glass;Known glass density ρ, thereby calculate one meter board width weight: g=d*w*ρ*x, the draw amount of each hour is Q=g*v1=d*w*ρ*x*v1, according to 24 hours, calculate all-day draw amount G=d*w*ρ*x*v1*24.In the application, glass is conveyed on conveying track, and the measurement of glass thickness and draw amount is completed, and the production of glass is not affected.

Description

Technical Field

[0001] This invention relates to the field of glass testing equipment, and more particularly to an online method for detecting glass thickness and tensile strength. Background Technology

[0002] Glass thickness is a critical quality control point in glass production, directly affecting product performance. Drawing amount is also an important output monitoring indicator in glass production. Frequent and significant increases or decreases in drawing amount can cause molten glass to churn within the furnace, allowing impurities from the bottom layer to rise into the upper glass flow, resulting in defects such as bubbles and inclusions on the glass surface. This leads to significant fluctuations in glass quality, and in severe cases, a sharp decline in glass quality.

[0003] Patent number "CN113418457A" discloses a glass thickness detection mechanism. However, this patent cannot automatically detect the thickness of continuously produced glass, which leads to the failure to detect thickness abnormalities in a timely manner, affecting product quality. Furthermore, the thickness detection device used is a camera, which has low accuracy and cannot calculate the pulling amount.

[0004] Patent number "CN114659925A" discloses an "online drawing amount detection device and its usage method". In this patent, glass is weighed, but the lifting roller needs to be lowered during the weighing process, which affects the normal production of glass. Summary of the Invention

[0005] The purpose of this invention is to provide an online detection method for glass thickness and drawing amount.

[0006] The innovation of this invention lies in the fact that the thickness and pulling amount of the glass are measured while the glass is being transported on the conveying track, without affecting the glass production.

[0007] To achieve the above-mentioned objectives, the technical solution of this invention is as follows:

[0008] A method for online detection of glass thickness and pull amount includes a conveying track, on which a detection component is provided. The detection component includes a crossbar arranged above the conveying track, a thickness testing mechanism and a speed measuring wheel on the crossbar, a pressing mechanism for pressing the speed measuring wheel downwards on the speed measuring wheel, and a moving component for moving the thickness testing mechanism along the crossbar on the crossbar. The moving component and the speed measuring wheel are connected through a PLC control system, and there is an angle θ between the conveying direction of the crossbar and the conveying track.

[0009] (1) The glass is transported on the conveying track, and the thickness testing mechanism runs along the crossbar. The speed measuring wheel is pressed against the glass and rotates as the glass moves. Based on the glass speed v1 measured by the speed measuring wheel, the thickness testing mechanism moves at a speed v2, so that v1 and v2 satisfy v1=v2·cosθ, where v1 and v2 are the moving distances per hour, i.e. v2=v1 / cosθ. This operating mode ensures that the line connecting each point of the thickness testing mechanism is a straight line and parallel to the width of the glass. The average value of the glass thickness d is obtained by averaging the values ​​of each point measured by the thickness testing mechanism.

[0010] (2) When the thickness testing mechanism moves, the initial time when it detects glass is recorded as the start time t1, and the time when it fails to detect glass is recorded as the end time t2. The effective glass detection time t = t2 - t1; the oblique width of the glass L = (t2 - t1) * v2 = (t2 - t1) * v1 / cosθ can be calculated, and the glass width is w = L * sinθ = (t2 - t1) * v1 * sinθ / cosθ = (t2 - t1) * v1 * tanθ;

[0011] (3) Calculate the compensation coefficient x for different glass types: actual weight / theoretical equivalent weight;

[0012] (4) Given the density ρ of the glass, the weight of a one-meter-wide plate can be calculated as: g = d * w * ρ * x. The pulling amount per hour is Q = g * v1 = d * w * ρ * x * v1. The total pulling amount for 24 hours is calculated as G = d * w * ρ * x * v1 * 24.

[0013] Furthermore, the thickness testing mechanism is a laser coaxial displacement meter.

[0014] Furthermore, the movable component is equipped with a lifting component that drives the thickness testing mechanism to move up and down. The up and down movement of the thickness testing mechanism is adjustable.

[0015] Furthermore, the crossbar is fixed by columns arranged on both sides of the conveyor track; the bottom of the columns is equipped with a height-adjustable base. The height of the crossbar can be adjusted.

[0016] Furthermore, a protective cover is provided at the thickness testing mechanism. This prevents the thickness testing mechanism from being easily damaged.

[0017] Furthermore, a cooling fan is installed inside the protective cover to cool the thickness testing mechanism.

[0018] Furthermore, the speed measuring wheel and the crossbar are hinged together by a support rod. The pressing mechanism is a gravity block arranged on the speed measuring wheel, or a spring connected between the support rod and the crossbar. The spring is arranged below the support rod, and there is a second angle between the spring and the support rod. The speed measuring wheel presses against the glass by the spring or the gravity block, and the speed measuring wheel measures the running speed of the glass.

[0019] Furthermore, the moving component is a lead screw module or a rack and pinion module.

[0020] Furthermore, limit switches are provided at both ends of the crossbar. These limit switches are used to control the running distance of the thickness testing mechanism.

[0021] Furthermore, the support rod is connected to the crossbar via a connecting piece. The connecting piece has vertically arranged oblong holes, and the crossbar has several grooves arranged horizontally along the crossbar. Connecting screws for connecting with the oblong holes are installed within these grooves. The position of the support rod relative to the crossbar is easily adjustable.

[0022] The beneficial effects of this invention are:

[0023] 1. In this invention, the thickness and pulling amount of the glass are measured while the glass is being transported on the conveying track, without affecting the glass production.

[0024] 2. The present invention is an online continuous measurement system that can accurately detect glass thickness and calculate drawing amount without damaging the glass, and can detect thickness abnormalities in a timely manner, thereby improving the process control capability of glass products.

[0025] 3. In this invention, the equipment can be flexibly adjusted according to changes in the thickness and width of the glass. Attached Figure Description

[0026] Figure 1 This is a top view of the present invention.

[0027] Figure 2 This is a schematic diagram of one side of the invention.

[0028] Figure 3 for Figure 2 A magnified view of a portion of the image.

[0029] Figure 4 This is a schematic diagram of the structure on the other side of the present invention.

[0030] Figure 5 For this Figure 4 A magnified view of a portion of the image. Detailed Implementation

[0031] The technical solutions in the embodiments of the present invention will now be clearly and completely described in conjunction with the accompanying drawings.

[0032] Example 1: As Figure 1 , 2As shown in Figures 3, 4, and 5, an online detection method for glass thickness and tensile strength includes a conveying track 1. A detection component 2 is mounted on the conveying track 1. The detection component 2 includes a crossbar 3 positioned above the conveying track 1, which is fixed by columns 9 positioned on both sides of the conveying track 1. A height adjustment base 10 is located at the bottom of each column 9. A thickness testing mechanism 4 and a speed measuring wheel 5 are mounted on the crossbar 3. The thickness testing mechanism 4 is a laser coaxial displacement gauge. A protective cover 11 is provided at the thickness testing mechanism 4, and a cooling fan 12 is installed inside the protective cover 11. A clamping mechanism 6 is provided on the speed measuring wheel 5 to press it downwards. The speed measuring wheel 5 and the crossbar 3 are hinged together by a support rod 13. The clamping mechanism 6 is a gravity block 6.1 positioned on the speed measuring wheel 5. The support rod 13 is connected to the crossbar 3 via a connecting piece 14. The connecting piece 14 has vertically arranged oblong holes 14.1. The crossbar 3 has several channels 3.1 arranged horizontally along the crossbar 3. Each channel 3.1 contains a connecting screw 15 for connecting to the oblong holes 14.1. The crossbar 3 has a moving assembly 7 for moving the thickness testing mechanism along the crossbar. The moving assembly 7 is a screw module or a rack and pinion module. The moving assembly 7 also has a lifting assembly 8 for moving the thickness testing mechanism 4 up and down. The lifting assembly 8 can be a cylinder. The moving assembly 7 and the speed measuring wheel 5 are connected via a PLC control system. Limit switches 16 are provided at both ends of the crossbar 3. There is an angle θ between the crossbar 3 and the conveying direction of the conveying track 1.

[0033] Glass is conveyed on conveyor track 1, and thickness testing mechanism 4 runs along crossbar 3. Speed ​​measuring wheel 5 is pressed against the glass and rotates as the glass moves. Based on the glass speed v1 measured by speed measuring wheel 5, the moving speed v2 of thickness testing mechanism 4 is calculated, ensuring that v1 = v2·cosθ, where v1 and v2 are the moving distances per hour, i.e., v2 = v1 / cosθ. This operating mode ensures that the line connecting all points measured by thickness testing mechanism 4 is a straight line parallel to the glass width. The average glass thickness d is obtained by averaging the measurements from all points measured by thickness testing mechanism 4. The initial detection of glass by thickness testing mechanism 4 is recorded as the start time t1, and the failure to detect glass is recorded as the end time. Given t2, the effective detection time of the glass is t = t2 - t1; the oblique width of the glass can be calculated as L = (t2 - t1) * v2 = (t2 - t1) * v1 / cosθ, and the glass width is w = L * sinθ = (t2 - t1) * v1 * sinθ / cosθ = (t2 - t1) * v1 * tanθ; the compensation coefficient of the glass is calculated according to different glass types as x = actual weight / theoretical converted weight; given the glass density ρ, the weight of one meter wide plate can be calculated as g = d * w * ρ * x, and the pulling amount per hour is Q = g * v1 = d * w * ρ * x * v1. The total pulling amount for 24 hours is calculated as G = d * w * ρ * x * v1 * 24.

[0034] Example 2: Referring to Example 1, the clamping mechanism 6 is a spring 6.2 connected between the support rod 13 and the crossbar 3. The spring 6.2 is arranged below the support rod 13, and there is a second included angle between the spring 6.2 and the support rod 13.

[0035] Test data:

[0036] 1. Thickness test data were collected for a 2.0mm thick glass sample, with 5 test points:

[0037]

[0038]

[0039] 2. Calculation data of tensile strength for a 2.0mm thick glass sample.

[0040] Given that the density of glass ρ = 2.5 × 10⁻⁶ 3 Kg / m 3

[0041] g=d*w*ρ*x*10 -6

[0042] G=d*w*ρ*x*v1*24*10 -9

[0043] X = 0.97

[0044] The total daily pull volume was calculated for a glass sheet with a thickness of 2.0 mm and a width of 2295 mm.

[0045]

[0046] The total daily pull volume was calculated for a glass sheet with a thickness of 2.0 mm and a width of 2452 mm.

[0047]

[0048]

[0049] The described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A method for online detection of glass thickness and drawing amount, comprising a conveying track, characterized in that, The conveying track is equipped with a detection component, which includes a crossbar arranged above the conveying track. The crossbar is equipped with a thickness testing mechanism and a speed measuring wheel. The speed measuring wheel is equipped with a pressing mechanism that presses the speed measuring wheel downward. The crossbar is equipped with a moving component that moves the thickness testing mechanism along the crossbar. The moving component and the speed measuring wheel are connected through a PLC control system. There is an angle θ between the conveying direction of the crossbar and the conveying track. (1) The glass is conveyed on the conveying track, and the thickness testing mechanism runs along the crossbar. The speed measuring wheel presses against the glass and rotates as the glass moves. Based on the glass speed v1 measured by the speed measuring wheel, the thickness testing mechanism moves at a speed v2, ensuring that v1 and v2 satisfy v1=v2·cosθ, where v1 is the distance the glass moves per hour and v2 is the distance the thickness testing mechanism moves per hour, i.e., v2=v1 / cosθ. This operating method ensures that the line connecting all points of the thickness testing mechanism during testing is a straight line and parallel to the width of the glass; through The average value of the glass thickness d is obtained by taking the average value of each point measured by the thickness testing mechanism; (2) When the thickness testing mechanism moves, the initial time when the glass is detected is recorded as the start time t1, and the time when the glass is not detected is recorded as the end time t2. The effective detection time of the glass is t=t2-t1; the oblique width of the glass is calculated as L=(t2-t1)*v2=(t2-t1)*v1 / cosθ, and the glass width is w=L*sinθ=(t2-t1)*v1*sinθ / cosθ=(t2-t1)*v1*tanθ; (3) Calculate the compensation coefficient of glass according to different glass types: x = actual weight / theoretical equivalent weight; (4) Given the density ρ of the glass, the weight g of a one-meter-wide plate can be calculated: g = d * w * ρ * x. The pulling amount per hour is Q = g * v1 = d * w * ρ * x * v1. The total pulling amount for 24 hours is G = d * w * ρ * x * v1 * 24.

2. The online detection method for glass thickness and drawing amount according to claim 1, characterized in that, The thickness testing mechanism is a laser coaxial displacement meter.

3. The online detection method for glass thickness and drawing amount according to claim 1, characterized in that, The movable component is equipped with a lifting component that drives the thickness testing mechanism to move up and down.

4. The online detection method for glass thickness and drawing amount according to claim 1, characterized in that, The crossbar is fixed by columns arranged on both sides of the conveying track; the bottom of the columns is equipped with a height adjustment base.

5. The online detection method for glass thickness and drawing amount according to claim 1, characterized in that, The thickness testing mechanism is equipped with a protective cover.

6. The online detection method for glass thickness and drawing amount according to claim 5, characterized in that, The protective cover is equipped with a cooling fan.

7. The online detection method for glass thickness and drawing amount according to claim 1, characterized in that, The speed measuring wheel and the crossbar are hinged together by a support rod. The clamping mechanism is a gravity block arranged on the speed measuring wheel, or a spring connected between the support rod and the crossbar. The spring is arranged below the support rod, and there is a second angle between the spring and the support rod.

8. The online detection method for glass thickness and drawing amount according to claim 1, characterized in that, The moving component is a lead screw module or a gear and rack module.

9. The online detection method for glass thickness and drawing amount according to claim 1, characterized in that, Limit switches are provided at both ends of the crossbar.

10. The online detection method for glass thickness and drawing amount according to claim 7, characterized in that, The support rod is connected to the crossbar via a connecting piece. The connecting piece has vertically arranged waist-shaped holes, and the crossbar has several grooves arranged horizontally along the crossbar. The grooves are provided with connecting screws for connecting with the waist-shaped holes.

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